How to Use This Tool
Turn a target store conversion rate into the extra installs needed from current impressions. A percentage target sounds actionable until nobody translates it into an acquisition count.
Why App Install Gap needs more than a raw total
The gap should use the same unique-impression definition and date window as the store dashboard. For this page, the useful comparison is additional installs needed, not whichever input happens to be largest. The App Install Gap result answers the decision in the heading and should not be reused as a score for a different workflow.
The exact App Install Gap formula
Additional installs equal impressions × target conversion rate minus current downloads, floored at zero. The visible fields are Unique store impressions, Current downloads and Target conversion rate. For App Install Gap, read each printed unit before entry and make the values describe one transaction, cohort or reporting window. If those scopes differ, the displayed additional installs needed may be arithmetically valid but operationally meaningless.
Interpreting additional installs needed
Prioritize page assets or traffic sources only when the required lift is plausible for the measured impression base. The ten-percent comparison is deliberately narrow: it tests the influence of unique store impressions and is neither a forecast nor a confidence interval. Preserve the values used, their dates and the resulting decision so a later reviewer can reproduce why App Install Gap supported the choice.
What this App Install Gap model leaves out
Attributed downloads, redownloads and delayed reporting can differ by platform and dashboard filter. That is where App Install Gap stops being trustworthy. If an excluded factor could reverse additional installs needed, extend the model explicitly or use the authoritative account system instead of hiding the factor inside an unexplained adjustment.
Evidence and independent verification
The reference reviewed for App Install Gap is Apple Developer — Analytics metric definitions. Apple Developer — Analytics metric definitions supports the named definition or rule but does not supply private values for additional installs needed. Before acting on the result, reconcile the worked example with the relevant dashboard, invoice, export or measurement.
Private, reproducible calculation
App Install Gap runs its arithmetic in the current browser tab and requests no login or API key. That keeps the App Install Gap inputs away from the site's calculation server, while leaving the user responsible for detecting stale data or a changed platform rule. When an assumption changes, reopen Apple Developer — Analytics metric definitions and rerun the saved App Install Gap scenario.
Sources & assumptions
Tool Spec v2 · verified 2026-08-20. Platform rules and fees can change; the editable inputs remain authoritative for your account.
Official references
- Apple Developer — Analytics metric definitions (checked 2026-08-20)
Model assumptions
- Every input covers the same reporting period or cohort.
- Attributed downloads, redownloads and delayed reporting can differ by platform and dashboard filter.
- The calculator uses only the visible fields and does not fetch account data.
